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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: generic package, can't find an error
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Date: Sat, 12 May 2007 17:15:33 +0200
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Date: 2007-05-12T17:15:21+02:00
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On 12 May 2007 06:50:17 -0700, pilarp@poczta.onet.pl wrote:

> I wrote a small program using a generic package, one of its functions
> (the one posted below, named read_file_text) was supposed to get some
> elements from a text file and write them on a standard output. In the
> test program the package was instantiated with float type. The
> remaining procedures and functions work properly, so I excluded them
> from the source code of my program which you can see below. The source
> code is included in 3 separate files: arrays.ads (package
> specification), arrays.adb (package body) and test_arrays.adb (test
> program using the package). While I compile arrays.ads and arrays.adb
> succesfully, I get the following compiler error when I try to compile
> test_arrays.adb:
> 
> "No visible program matches the specification for "Get" ". Please look
> at the code and tell me what is wrong.
>
> arrays.ads:
> 
> with Ada.Text_Io;
> use ada.text_io;
> generic
>    type element is private;
>    with procedure get(f:in file_type; o: out element) is <>;

See the declaration of Get in Ada.Text_IO.Float_IO (of which instance
Ada.Float_Text_IO is). It is (RM A.10.9(7)):

 procedure Get(File : in File_Type; Item : out Num; Width : in Field := 0); 

So there is a third parameter you have to add to your formal procedure.

---------------
P.S. John P Woodruff did what you are probably looking for. See

http://www.dmitry-kazakov.de/ada/Numeric-Name-IO.htm

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de